The Russo-Circassian War, also known as the Russian invasion of Circassia, was the invasion of Circassia by Russia, starting in 1763 (O.S) with the Russian Empire assuming authority in Circassia, followed by the Circassian refusal, and ending 101 years later with the last army of Circassia defeated on 21 May 1864 (O.S), making it exhausting and casualty-heavy for both sides. The Russo-Circassian War was the longest war both Russia and Circassia have ever fought and the longest war in the Caucasus region.

Abrek is a North Caucasian term used for a lone North Caucasian warrior living a partisan lifestyle outside power and law and fighting for a just cause. Abreks were irregular soldiers who abandoned all material life, including their family and friends, in order to fight for a just cause, to worship, and to meditate. The term was mostly used by people who struggled against Russian colonialism, mostly a guerrilla struggle during Russian expansion in the North Caucasus in the 19th century. An abrek would renounce any contact with friends and relatives, and then dedicate his life to praying and fighting for justice. Some abreks stole from the rich to give to the poor while others protected Caucasian villages from foreign attacks. The abrek lifestyle included a lonely life in the unexplored wilderness. Later, the majority of abreks became devoted Sufi Muslims. During the Caucasian War, which is divided into the Russo-Circassian War and the Murid War, there was constant raids between Russian and Caucasian settlements.